A281330 Number of 5Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.

0, 2976, 521848, 37854870, 2628860468, 166805996158, 10160537599967, 600433381268898, 34723542072723416, 1975325863716030310, 110929557975063540816, 6165067026942753179636, 339710976507404522326590

Offset

1,2

Comments

Row 5 of A281326.

Links

R. H. Hardin, Table of n, a(n) for n = 1..40

Example

Some solutions for n=2
..0..0. .0..1. .0..0. .0..0. .0..1. .0..1. .0..1. .0..1. .0..0. .0..0
..1..0. .0..0. .0..1. .0..1. .0..1. .0..0. .2..0. .1..2. .1..1. .0..1
..1..1. .2..0. .2..2. .1..0. .1..1. .0..1. .0..2. .0..0. .2..1. .0..2
..0..1. .2..2. .0..2. .0..1. .2..1. .2..2. .1..2. .0..1. .1..1. .0..1
..1..1. .2..0. .1..2. .1..0. .1..2. .1..0. .2..2. .1..0. .2..1. .0..2

Crossrefs

Cf. A281326.

Sequence in context: A124595 A186549 A236140 * A289455 A360666 A202775

Adjacent sequences: A281327 A281328 A281329 * A281331 A281332 A281333

Keyword

nonn

Author

R. H. Hardin, Jan 20 2017

Status

approved